Lawyers for Tarek Mehanna have asked the US Supreme Court to hear an appeal of the former Sudbury man’s conviction on charges of helping Al Qaeda, plotting to kill Americans, and lying to the FBI.

The request was filed on Monday, according to court records. Federal prosecutors have until April 18 to respond, and the high court will then decide whether to take up the case.

A federal jury in Boston convicted Mehanna in December 2011 on charges of conspiring to provide material support to terrorists, conspiring to kill in a foreign country, and of lying to authorities in a terrorism investigation.